| #include "git-compat-util.h" |
| #include "cache.h" |
| #include "config.h" |
| #include "pkt-line.h" |
| #include "quote.h" |
| #include "refs.h" |
| #include "run-command.h" |
| #include "remote.h" |
| #include "connect.h" |
| #include "url.h" |
| #include "string-list.h" |
| #include "sha1-array.h" |
| #include "transport.h" |
| #include "strbuf.h" |
| #include "version.h" |
| #include "protocol.h" |
| #include "alias.h" |
| |
| static char *server_capabilities_v1; |
| static struct argv_array server_capabilities_v2 = ARGV_ARRAY_INIT; |
| static const char *parse_feature_value(const char *, const char *, int *); |
| |
| static int check_ref(const char *name, unsigned int flags) |
| { |
| if (!flags) |
| return 1; |
| |
| if (!skip_prefix(name, "refs/", &name)) |
| return 0; |
| |
| /* REF_NORMAL means that we don't want the magic fake tag refs */ |
| if ((flags & REF_NORMAL) && check_refname_format(name, 0)) |
| return 0; |
| |
| /* REF_HEADS means that we want regular branch heads */ |
| if ((flags & REF_HEADS) && starts_with(name, "heads/")) |
| return 1; |
| |
| /* REF_TAGS means that we want tags */ |
| if ((flags & REF_TAGS) && starts_with(name, "tags/")) |
| return 1; |
| |
| /* All type bits clear means that we are ok with anything */ |
| return !(flags & ~REF_NORMAL); |
| } |
| |
| int check_ref_type(const struct ref *ref, int flags) |
| { |
| return check_ref(ref->name, flags); |
| } |
| |
| static NORETURN void die_initial_contact(int unexpected) |
| { |
| /* |
| * A hang-up after seeing some response from the other end |
| * means that it is unexpected, as we know the other end is |
| * willing to talk to us. A hang-up before seeing any |
| * response does not necessarily mean an ACL problem, though. |
| */ |
| if (unexpected) |
| die(_("the remote end hung up upon initial contact")); |
| else |
| die(_("Could not read from remote repository.\n\n" |
| "Please make sure you have the correct access rights\n" |
| "and the repository exists.")); |
| } |
| |
| /* Checks if the server supports the capability 'c' */ |
| int server_supports_v2(const char *c, int die_on_error) |
| { |
| int i; |
| |
| for (i = 0; i < server_capabilities_v2.argc; i++) { |
| const char *out; |
| if (skip_prefix(server_capabilities_v2.argv[i], c, &out) && |
| (!*out || *out == '=')) |
| return 1; |
| } |
| |
| if (die_on_error) |
| die(_("server doesn't support '%s'"), c); |
| |
| return 0; |
| } |
| |
| int server_supports_feature(const char *c, const char *feature, |
| int die_on_error) |
| { |
| int i; |
| |
| for (i = 0; i < server_capabilities_v2.argc; i++) { |
| const char *out; |
| if (skip_prefix(server_capabilities_v2.argv[i], c, &out) && |
| (!*out || *(out++) == '=')) { |
| if (parse_feature_request(out, feature)) |
| return 1; |
| else |
| break; |
| } |
| } |
| |
| if (die_on_error) |
| die(_("server doesn't support feature '%s'"), feature); |
| |
| return 0; |
| } |
| |
| static void process_capabilities_v2(struct packet_reader *reader) |
| { |
| while (packet_reader_read(reader) == PACKET_READ_NORMAL) |
| argv_array_push(&server_capabilities_v2, reader->line); |
| |
| if (reader->status != PACKET_READ_FLUSH) |
| die(_("expected flush after capabilities")); |
| } |
| |
| enum protocol_version discover_version(struct packet_reader *reader) |
| { |
| enum protocol_version version = protocol_unknown_version; |
| |
| /* |
| * Peek the first line of the server's response to |
| * determine the protocol version the server is speaking. |
| */ |
| switch (packet_reader_peek(reader)) { |
| case PACKET_READ_EOF: |
| die_initial_contact(0); |
| case PACKET_READ_FLUSH: |
| case PACKET_READ_DELIM: |
| version = protocol_v0; |
| break; |
| case PACKET_READ_NORMAL: |
| version = determine_protocol_version_client(reader->line); |
| break; |
| } |
| |
| switch (version) { |
| case protocol_v2: |
| process_capabilities_v2(reader); |
| break; |
| case protocol_v1: |
| /* Read the peeked version line */ |
| packet_reader_read(reader); |
| break; |
| case protocol_v0: |
| break; |
| case protocol_unknown_version: |
| BUG("unknown protocol version"); |
| } |
| |
| return version; |
| } |
| |
| static void parse_one_symref_info(struct string_list *symref, const char *val, int len) |
| { |
| char *sym, *target; |
| struct string_list_item *item; |
| |
| if (!len) |
| return; /* just "symref" */ |
| /* e.g. "symref=HEAD:refs/heads/master" */ |
| sym = xmemdupz(val, len); |
| target = strchr(sym, ':'); |
| if (!target) |
| /* just "symref=something" */ |
| goto reject; |
| *(target++) = '\0'; |
| if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) || |
| check_refname_format(target, REFNAME_ALLOW_ONELEVEL)) |
| /* "symref=bogus:pair */ |
| goto reject; |
| item = string_list_append_nodup(symref, sym); |
| item->util = target; |
| return; |
| reject: |
| free(sym); |
| return; |
| } |
| |
| static void annotate_refs_with_symref_info(struct ref *ref) |
| { |
| struct string_list symref = STRING_LIST_INIT_DUP; |
| const char *feature_list = server_capabilities_v1; |
| |
| while (feature_list) { |
| int len; |
| const char *val; |
| |
| val = parse_feature_value(feature_list, "symref", &len); |
| if (!val) |
| break; |
| parse_one_symref_info(&symref, val, len); |
| feature_list = val + 1; |
| } |
| string_list_sort(&symref); |
| |
| for (; ref; ref = ref->next) { |
| struct string_list_item *item; |
| item = string_list_lookup(&symref, ref->name); |
| if (!item) |
| continue; |
| ref->symref = xstrdup((char *)item->util); |
| } |
| string_list_clear(&symref, 0); |
| } |
| |
| static void process_capabilities(const char *line, int *len) |
| { |
| int nul_location = strlen(line); |
| if (nul_location == *len) |
| return; |
| server_capabilities_v1 = xstrdup(line + nul_location + 1); |
| *len = nul_location; |
| } |
| |
| static int process_dummy_ref(const char *line) |
| { |
| struct object_id oid; |
| const char *name; |
| |
| if (parse_oid_hex(line, &oid, &name)) |
| return 0; |
| if (*name != ' ') |
| return 0; |
| name++; |
| |
| return oideq(&null_oid, &oid) && !strcmp(name, "capabilities^{}"); |
| } |
| |
| static void check_no_capabilities(const char *line, int len) |
| { |
| if (strlen(line) != len) |
| warning(_("ignoring capabilities after first line '%s'"), |
| line + strlen(line)); |
| } |
| |
| static int process_ref(const char *line, int len, struct ref ***list, |
| unsigned int flags, struct oid_array *extra_have) |
| { |
| struct object_id old_oid; |
| const char *name; |
| |
| if (parse_oid_hex(line, &old_oid, &name)) |
| return 0; |
| if (*name != ' ') |
| return 0; |
| name++; |
| |
| if (extra_have && !strcmp(name, ".have")) { |
| oid_array_append(extra_have, &old_oid); |
| } else if (!strcmp(name, "capabilities^{}")) { |
| die(_("protocol error: unexpected capabilities^{}")); |
| } else if (check_ref(name, flags)) { |
| struct ref *ref = alloc_ref(name); |
| oidcpy(&ref->old_oid, &old_oid); |
| **list = ref; |
| *list = &ref->next; |
| } |
| check_no_capabilities(line, len); |
| return 1; |
| } |
| |
| static int process_shallow(const char *line, int len, |
| struct oid_array *shallow_points) |
| { |
| const char *arg; |
| struct object_id old_oid; |
| |
| if (!skip_prefix(line, "shallow ", &arg)) |
| return 0; |
| |
| if (get_oid_hex(arg, &old_oid)) |
| die(_("protocol error: expected shallow sha-1, got '%s'"), arg); |
| if (!shallow_points) |
| die(_("repository on the other end cannot be shallow")); |
| oid_array_append(shallow_points, &old_oid); |
| check_no_capabilities(line, len); |
| return 1; |
| } |
| |
| enum get_remote_heads_state { |
| EXPECTING_FIRST_REF = 0, |
| EXPECTING_REF, |
| EXPECTING_SHALLOW, |
| EXPECTING_DONE, |
| }; |
| |
| /* |
| * Read all the refs from the other end |
| */ |
| struct ref **get_remote_heads(struct packet_reader *reader, |
| struct ref **list, unsigned int flags, |
| struct oid_array *extra_have, |
| struct oid_array *shallow_points) |
| { |
| struct ref **orig_list = list; |
| int len = 0; |
| enum get_remote_heads_state state = EXPECTING_FIRST_REF; |
| |
| *list = NULL; |
| |
| while (state != EXPECTING_DONE) { |
| switch (packet_reader_read(reader)) { |
| case PACKET_READ_EOF: |
| die_initial_contact(1); |
| case PACKET_READ_NORMAL: |
| len = reader->pktlen; |
| break; |
| case PACKET_READ_FLUSH: |
| state = EXPECTING_DONE; |
| break; |
| case PACKET_READ_DELIM: |
| die(_("invalid packet")); |
| } |
| |
| switch (state) { |
| case EXPECTING_FIRST_REF: |
| process_capabilities(reader->line, &len); |
| if (process_dummy_ref(reader->line)) { |
| state = EXPECTING_SHALLOW; |
| break; |
| } |
| state = EXPECTING_REF; |
| /* fallthrough */ |
| case EXPECTING_REF: |
| if (process_ref(reader->line, len, &list, flags, extra_have)) |
| break; |
| state = EXPECTING_SHALLOW; |
| /* fallthrough */ |
| case EXPECTING_SHALLOW: |
| if (process_shallow(reader->line, len, shallow_points)) |
| break; |
| die(_("protocol error: unexpected '%s'"), reader->line); |
| case EXPECTING_DONE: |
| break; |
| } |
| } |
| |
| annotate_refs_with_symref_info(*orig_list); |
| |
| return list; |
| } |
| |
| /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */ |
| static int process_ref_v2(const char *line, struct ref ***list) |
| { |
| int ret = 1; |
| int i = 0; |
| struct object_id old_oid; |
| struct ref *ref; |
| struct string_list line_sections = STRING_LIST_INIT_DUP; |
| const char *end; |
| |
| /* |
| * Ref lines have a number of fields which are space deliminated. The |
| * first field is the OID of the ref. The second field is the ref |
| * name. Subsequent fields (symref-target and peeled) are optional and |
| * don't have a particular order. |
| */ |
| if (string_list_split(&line_sections, line, ' ', -1) < 2) { |
| ret = 0; |
| goto out; |
| } |
| |
| if (parse_oid_hex(line_sections.items[i++].string, &old_oid, &end) || |
| *end) { |
| ret = 0; |
| goto out; |
| } |
| |
| ref = alloc_ref(line_sections.items[i++].string); |
| |
| oidcpy(&ref->old_oid, &old_oid); |
| **list = ref; |
| *list = &ref->next; |
| |
| for (; i < line_sections.nr; i++) { |
| const char *arg = line_sections.items[i].string; |
| if (skip_prefix(arg, "symref-target:", &arg)) |
| ref->symref = xstrdup(arg); |
| |
| if (skip_prefix(arg, "peeled:", &arg)) { |
| struct object_id peeled_oid; |
| char *peeled_name; |
| struct ref *peeled; |
| if (parse_oid_hex(arg, &peeled_oid, &end) || *end) { |
| ret = 0; |
| goto out; |
| } |
| |
| peeled_name = xstrfmt("%s^{}", ref->name); |
| peeled = alloc_ref(peeled_name); |
| |
| oidcpy(&peeled->old_oid, &peeled_oid); |
| **list = peeled; |
| *list = &peeled->next; |
| |
| free(peeled_name); |
| } |
| } |
| |
| out: |
| string_list_clear(&line_sections, 0); |
| return ret; |
| } |
| |
| struct ref **get_remote_refs(int fd_out, struct packet_reader *reader, |
| struct ref **list, int for_push, |
| const struct argv_array *ref_prefixes, |
| const struct string_list *server_options) |
| { |
| int i; |
| *list = NULL; |
| |
| if (server_supports_v2("ls-refs", 1)) |
| packet_write_fmt(fd_out, "command=ls-refs\n"); |
| |
| if (server_supports_v2("agent", 0)) |
| packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized()); |
| |
| if (server_options && server_options->nr && |
| server_supports_v2("server-option", 1)) |
| for (i = 0; i < server_options->nr; i++) |
| packet_write_fmt(fd_out, "server-option=%s", |
| server_options->items[i].string); |
| |
| packet_delim(fd_out); |
| /* When pushing we don't want to request the peeled tags */ |
| if (!for_push) |
| packet_write_fmt(fd_out, "peel\n"); |
| packet_write_fmt(fd_out, "symrefs\n"); |
| for (i = 0; ref_prefixes && i < ref_prefixes->argc; i++) { |
| packet_write_fmt(fd_out, "ref-prefix %s\n", |
| ref_prefixes->argv[i]); |
| } |
| packet_flush(fd_out); |
| |
| /* Process response from server */ |
| while (packet_reader_read(reader) == PACKET_READ_NORMAL) { |
| if (!process_ref_v2(reader->line, &list)) |
| die(_("invalid ls-refs response: %s"), reader->line); |
| } |
| |
| if (reader->status != PACKET_READ_FLUSH) |
| die(_("expected flush after ref listing")); |
| |
| return list; |
| } |
| |
| static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp) |
| { |
| int len; |
| |
| if (!feature_list) |
| return NULL; |
| |
| len = strlen(feature); |
| while (*feature_list) { |
| const char *found = strstr(feature_list, feature); |
| if (!found) |
| return NULL; |
| if (feature_list == found || isspace(found[-1])) { |
| const char *value = found + len; |
| /* feature with no value (e.g., "thin-pack") */ |
| if (!*value || isspace(*value)) { |
| if (lenp) |
| *lenp = 0; |
| return value; |
| } |
| /* feature with a value (e.g., "agent=git/1.2.3") */ |
| else if (*value == '=') { |
| value++; |
| if (lenp) |
| *lenp = strcspn(value, " \t\n"); |
| return value; |
| } |
| /* |
| * otherwise we matched a substring of another feature; |
| * keep looking |
| */ |
| } |
| feature_list = found + 1; |
| } |
| return NULL; |
| } |
| |
| int parse_feature_request(const char *feature_list, const char *feature) |
| { |
| return !!parse_feature_value(feature_list, feature, NULL); |
| } |
| |
| const char *server_feature_value(const char *feature, int *len) |
| { |
| return parse_feature_value(server_capabilities_v1, feature, len); |
| } |
| |
| int server_supports(const char *feature) |
| { |
| return !!server_feature_value(feature, NULL); |
| } |
| |
| enum protocol { |
| PROTO_LOCAL = 1, |
| PROTO_FILE, |
| PROTO_SSH, |
| PROTO_GIT |
| }; |
| |
| int url_is_local_not_ssh(const char *url) |
| { |
| const char *colon = strchr(url, ':'); |
| const char *slash = strchr(url, '/'); |
| return !colon || (slash && slash < colon) || |
| has_dos_drive_prefix(url); |
| } |
| |
| static const char *prot_name(enum protocol protocol) |
| { |
| switch (protocol) { |
| case PROTO_LOCAL: |
| case PROTO_FILE: |
| return "file"; |
| case PROTO_SSH: |
| return "ssh"; |
| case PROTO_GIT: |
| return "git"; |
| default: |
| return "unknown protocol"; |
| } |
| } |
| |
| static enum protocol get_protocol(const char *name) |
| { |
| if (!strcmp(name, "ssh")) |
| return PROTO_SSH; |
| if (!strcmp(name, "git")) |
| return PROTO_GIT; |
| if (!strcmp(name, "git+ssh")) /* deprecated - do not use */ |
| return PROTO_SSH; |
| if (!strcmp(name, "ssh+git")) /* deprecated - do not use */ |
| return PROTO_SSH; |
| if (!strcmp(name, "file")) |
| return PROTO_FILE; |
| die(_("protocol '%s' is not supported"), name); |
| } |
| |
| static char *host_end(char **hoststart, int removebrackets) |
| { |
| char *host = *hoststart; |
| char *end; |
| char *start = strstr(host, "@["); |
| if (start) |
| start++; /* Jump over '@' */ |
| else |
| start = host; |
| if (start[0] == '[') { |
| end = strchr(start + 1, ']'); |
| if (end) { |
| if (removebrackets) { |
| *end = 0; |
| memmove(start, start + 1, end - start); |
| end++; |
| } |
| } else |
| end = host; |
| } else |
| end = host; |
| return end; |
| } |
| |
| #define STR_(s) # s |
| #define STR(s) STR_(s) |
| |
| static void get_host_and_port(char **host, const char **port) |
| { |
| char *colon, *end; |
| end = host_end(host, 1); |
| colon = strchr(end, ':'); |
| if (colon) { |
| long portnr = strtol(colon + 1, &end, 10); |
| if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) { |
| *colon = 0; |
| *port = colon + 1; |
| } else if (!colon[1]) { |
| *colon = 0; |
| } |
| } |
| } |
| |
| static void enable_keepalive(int sockfd) |
| { |
| int ka = 1; |
| |
| if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) |
| error_errno(_("unable to set SO_KEEPALIVE on socket")); |
| } |
| |
| #ifndef NO_IPV6 |
| |
| static const char *ai_name(const struct addrinfo *ai) |
| { |
| static char addr[NI_MAXHOST]; |
| if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0, |
| NI_NUMERICHOST) != 0) |
| xsnprintf(addr, sizeof(addr), "(unknown)"); |
| |
| return addr; |
| } |
| |
| /* |
| * Returns a connected socket() fd, or else die()s. |
| */ |
| static int git_tcp_connect_sock(char *host, int flags) |
| { |
| struct strbuf error_message = STRBUF_INIT; |
| int sockfd = -1; |
| const char *port = STR(DEFAULT_GIT_PORT); |
| struct addrinfo hints, *ai0, *ai; |
| int gai; |
| int cnt = 0; |
| |
| get_host_and_port(&host, &port); |
| if (!*port) |
| port = "<none>"; |
| |
| memset(&hints, 0, sizeof(hints)); |
| if (flags & CONNECT_IPV4) |
| hints.ai_family = AF_INET; |
| else if (flags & CONNECT_IPV6) |
| hints.ai_family = AF_INET6; |
| hints.ai_socktype = SOCK_STREAM; |
| hints.ai_protocol = IPPROTO_TCP; |
| |
| if (flags & CONNECT_VERBOSE) |
| fprintf(stderr, _("Looking up %s ... "), host); |
| |
| gai = getaddrinfo(host, port, &hints, &ai); |
| if (gai) |
| die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai)); |
| |
| if (flags & CONNECT_VERBOSE) |
| /* TRANSLATORS: this is the end of "Looking up %s ... " */ |
| fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port); |
| |
| for (ai0 = ai; ai; ai = ai->ai_next, cnt++) { |
| sockfd = socket(ai->ai_family, |
| ai->ai_socktype, ai->ai_protocol); |
| if ((sockfd < 0) || |
| (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) { |
| strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n", |
| host, cnt, ai_name(ai), strerror(errno)); |
| if (0 <= sockfd) |
| close(sockfd); |
| sockfd = -1; |
| continue; |
| } |
| if (flags & CONNECT_VERBOSE) |
| fprintf(stderr, "%s ", ai_name(ai)); |
| break; |
| } |
| |
| freeaddrinfo(ai0); |
| |
| if (sockfd < 0) |
| die(_("unable to connect to %s:\n%s"), host, error_message.buf); |
| |
| enable_keepalive(sockfd); |
| |
| if (flags & CONNECT_VERBOSE) |
| /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */ |
| fprintf_ln(stderr, _("done.")); |
| |
| strbuf_release(&error_message); |
| |
| return sockfd; |
| } |
| |
| #else /* NO_IPV6 */ |
| |
| /* |
| * Returns a connected socket() fd, or else die()s. |
| */ |
| static int git_tcp_connect_sock(char *host, int flags) |
| { |
| struct strbuf error_message = STRBUF_INIT; |
| int sockfd = -1; |
| const char *port = STR(DEFAULT_GIT_PORT); |
| char *ep; |
| struct hostent *he; |
| struct sockaddr_in sa; |
| char **ap; |
| unsigned int nport; |
| int cnt; |
| |
| get_host_and_port(&host, &port); |
| |
| if (flags & CONNECT_VERBOSE) |
| fprintf(stderr, _("Looking up %s ... "), host); |
| |
| he = gethostbyname(host); |
| if (!he) |
| die(_("unable to look up %s (%s)"), host, hstrerror(h_errno)); |
| nport = strtoul(port, &ep, 10); |
| if ( ep == port || *ep ) { |
| /* Not numeric */ |
| struct servent *se = getservbyname(port,"tcp"); |
| if ( !se ) |
| die(_("unknown port %s"), port); |
| nport = se->s_port; |
| } |
| |
| if (flags & CONNECT_VERBOSE) |
| /* TRANSLATORS: this is the end of "Looking up %s ... " */ |
| fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port); |
| |
| for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) { |
| memset(&sa, 0, sizeof sa); |
| sa.sin_family = he->h_addrtype; |
| sa.sin_port = htons(nport); |
| memcpy(&sa.sin_addr, *ap, he->h_length); |
| |
| sockfd = socket(he->h_addrtype, SOCK_STREAM, 0); |
| if ((sockfd < 0) || |
| connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) { |
| strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n", |
| host, |
| cnt, |
| inet_ntoa(*(struct in_addr *)&sa.sin_addr), |
| strerror(errno)); |
| if (0 <= sockfd) |
| close(sockfd); |
| sockfd = -1; |
| continue; |
| } |
| if (flags & CONNECT_VERBOSE) |
| fprintf(stderr, "%s ", |
| inet_ntoa(*(struct in_addr *)&sa.sin_addr)); |
| break; |
| } |
| |
| if (sockfd < 0) |
| die(_("unable to connect to %s:\n%s"), host, error_message.buf); |
| |
| enable_keepalive(sockfd); |
| |
| if (flags & CONNECT_VERBOSE) |
| /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */ |
| fprintf_ln(stderr, _("done.")); |
| |
| return sockfd; |
| } |
| |
| #endif /* NO_IPV6 */ |
| |
| |
| /* |
| * Dummy child_process returned by git_connect() if the transport protocol |
| * does not need fork(2). |
| */ |
| static struct child_process no_fork = CHILD_PROCESS_INIT; |
| |
| int git_connection_is_socket(struct child_process *conn) |
| { |
| return conn == &no_fork; |
| } |
| |
| static struct child_process *git_tcp_connect(int fd[2], char *host, int flags) |
| { |
| int sockfd = git_tcp_connect_sock(host, flags); |
| |
| fd[0] = sockfd; |
| fd[1] = dup(sockfd); |
| |
| return &no_fork; |
| } |
| |
| |
| static char *git_proxy_command; |
| |
| static int git_proxy_command_options(const char *var, const char *value, |
| void *cb) |
| { |
| if (!strcmp(var, "core.gitproxy")) { |
| const char *for_pos; |
| int matchlen = -1; |
| int hostlen; |
| const char *rhost_name = cb; |
| int rhost_len = strlen(rhost_name); |
| |
| if (git_proxy_command) |
| return 0; |
| if (!value) |
| return config_error_nonbool(var); |
| /* [core] |
| * ;# matches www.kernel.org as well |
| * gitproxy = netcatter-1 for kernel.org |
| * gitproxy = netcatter-2 for sample.xz |
| * gitproxy = netcatter-default |
| */ |
| for_pos = strstr(value, " for "); |
| if (!for_pos) |
| /* matches everybody */ |
| matchlen = strlen(value); |
| else { |
| hostlen = strlen(for_pos + 5); |
| if (rhost_len < hostlen) |
| matchlen = -1; |
| else if (!strncmp(for_pos + 5, |
| rhost_name + rhost_len - hostlen, |
| hostlen) && |
| ((rhost_len == hostlen) || |
| rhost_name[rhost_len - hostlen -1] == '.')) |
| matchlen = for_pos - value; |
| else |
| matchlen = -1; |
| } |
| if (0 <= matchlen) { |
| /* core.gitproxy = none for kernel.org */ |
| if (matchlen == 4 && |
| !memcmp(value, "none", 4)) |
| matchlen = 0; |
| git_proxy_command = xmemdupz(value, matchlen); |
| } |
| return 0; |
| } |
| |
| return git_default_config(var, value, cb); |
| } |
| |
| static int git_use_proxy(const char *host) |
| { |
| git_proxy_command = getenv("GIT_PROXY_COMMAND"); |
| git_config(git_proxy_command_options, (void*)host); |
| return (git_proxy_command && *git_proxy_command); |
| } |
| |
| static struct child_process *git_proxy_connect(int fd[2], char *host) |
| { |
| const char *port = STR(DEFAULT_GIT_PORT); |
| struct child_process *proxy; |
| |
| get_host_and_port(&host, &port); |
| |
| if (looks_like_command_line_option(host)) |
| die(_("strange hostname '%s' blocked"), host); |
| if (looks_like_command_line_option(port)) |
| die(_("strange port '%s' blocked"), port); |
| |
| proxy = xmalloc(sizeof(*proxy)); |
| child_process_init(proxy); |
| argv_array_push(&proxy->args, git_proxy_command); |
| argv_array_push(&proxy->args, host); |
| argv_array_push(&proxy->args, port); |
| proxy->in = -1; |
| proxy->out = -1; |
| if (start_command(proxy)) |
| die(_("cannot start proxy %s"), git_proxy_command); |
| fd[0] = proxy->out; /* read from proxy stdout */ |
| fd[1] = proxy->in; /* write to proxy stdin */ |
| return proxy; |
| } |
| |
| static char *get_port(char *host) |
| { |
| char *end; |
| char *p = strchr(host, ':'); |
| |
| if (p) { |
| long port = strtol(p + 1, &end, 10); |
| if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) { |
| *p = '\0'; |
| return p+1; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* |
| * Extract protocol and relevant parts from the specified connection URL. |
| * The caller must free() the returned strings. |
| */ |
| static enum protocol parse_connect_url(const char *url_orig, char **ret_host, |
| char **ret_path) |
| { |
| char *url; |
| char *host, *path; |
| char *end; |
| int separator = '/'; |
| enum protocol protocol = PROTO_LOCAL; |
| |
| if (is_url(url_orig)) |
| url = url_decode(url_orig); |
| else |
| url = xstrdup(url_orig); |
| |
| host = strstr(url, "://"); |
| if (host) { |
| *host = '\0'; |
| protocol = get_protocol(url); |
| host += 3; |
| } else { |
| host = url; |
| if (!url_is_local_not_ssh(url)) { |
| protocol = PROTO_SSH; |
| separator = ':'; |
| } |
| } |
| |
| /* |
| * Don't do destructive transforms as protocol code does |
| * '[]' unwrapping in get_host_and_port() |
| */ |
| end = host_end(&host, 0); |
| |
| if (protocol == PROTO_LOCAL) |
| path = end; |
| else if (protocol == PROTO_FILE && has_dos_drive_prefix(end)) |
| path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */ |
| else |
| path = strchr(end, separator); |
| |
| if (!path || !*path) |
| die(_("no path specified; see 'git help pull' for valid url syntax")); |
| |
| /* |
| * null-terminate hostname and point path to ~ for URL's like this: |
| * ssh://host.xz/~user/repo |
| */ |
| |
| end = path; /* Need to \0 terminate host here */ |
| if (separator == ':') |
| path++; /* path starts after ':' */ |
| if (protocol == PROTO_GIT || protocol == PROTO_SSH) { |
| if (path[1] == '~') |
| path++; |
| } |
| |
| path = xstrdup(path); |
| *end = '\0'; |
| |
| *ret_host = xstrdup(host); |
| *ret_path = path; |
| free(url); |
| return protocol; |
| } |
| |
| static const char *get_ssh_command(void) |
| { |
| const char *ssh; |
| |
| if ((ssh = getenv("GIT_SSH_COMMAND"))) |
| return ssh; |
| |
| if (!git_config_get_string_const("core.sshcommand", &ssh)) |
| return ssh; |
| |
| return NULL; |
| } |
| |
| enum ssh_variant { |
| VARIANT_AUTO, |
| VARIANT_SIMPLE, |
| VARIANT_SSH, |
| VARIANT_PLINK, |
| VARIANT_PUTTY, |
| VARIANT_TORTOISEPLINK, |
| }; |
| |
| static void override_ssh_variant(enum ssh_variant *ssh_variant) |
| { |
| const char *variant = getenv("GIT_SSH_VARIANT"); |
| |
| if (!variant && git_config_get_string_const("ssh.variant", &variant)) |
| return; |
| |
| if (!strcmp(variant, "auto")) |
| *ssh_variant = VARIANT_AUTO; |
| else if (!strcmp(variant, "plink")) |
| *ssh_variant = VARIANT_PLINK; |
| else if (!strcmp(variant, "putty")) |
| *ssh_variant = VARIANT_PUTTY; |
| else if (!strcmp(variant, "tortoiseplink")) |
| *ssh_variant = VARIANT_TORTOISEPLINK; |
| else if (!strcmp(variant, "simple")) |
| *ssh_variant = VARIANT_SIMPLE; |
| else |
| *ssh_variant = VARIANT_SSH; |
| } |
| |
| static enum ssh_variant determine_ssh_variant(const char *ssh_command, |
| int is_cmdline) |
| { |
| enum ssh_variant ssh_variant = VARIANT_AUTO; |
| const char *variant; |
| char *p = NULL; |
| |
| override_ssh_variant(&ssh_variant); |
| |
| if (ssh_variant != VARIANT_AUTO) |
| return ssh_variant; |
| |
| if (!is_cmdline) { |
| p = xstrdup(ssh_command); |
| variant = basename(p); |
| } else { |
| const char **ssh_argv; |
| |
| p = xstrdup(ssh_command); |
| if (split_cmdline(p, &ssh_argv) > 0) { |
| variant = basename((char *)ssh_argv[0]); |
| /* |
| * At this point, variant points into the buffer |
| * referenced by p, hence we do not need ssh_argv |
| * any longer. |
| */ |
| free(ssh_argv); |
| } else { |
| free(p); |
| return ssh_variant; |
| } |
| } |
| |
| if (!strcasecmp(variant, "ssh") || |
| !strcasecmp(variant, "ssh.exe")) |
| ssh_variant = VARIANT_SSH; |
| else if (!strcasecmp(variant, "plink") || |
| !strcasecmp(variant, "plink.exe")) |
| ssh_variant = VARIANT_PLINK; |
| else if (!strcasecmp(variant, "tortoiseplink") || |
| !strcasecmp(variant, "tortoiseplink.exe")) |
| ssh_variant = VARIANT_TORTOISEPLINK; |
| |
| free(p); |
| return ssh_variant; |
| } |
| |
| /* |
| * Open a connection using Git's native protocol. |
| * |
| * The caller is responsible for freeing hostandport, but this function may |
| * modify it (for example, to truncate it to remove the port part). |
| */ |
| static struct child_process *git_connect_git(int fd[2], char *hostandport, |
| const char *path, const char *prog, |
| enum protocol_version version, |
| int flags) |
| { |
| struct child_process *conn; |
| struct strbuf request = STRBUF_INIT; |
| /* |
| * Set up virtual host information based on where we will |
| * connect, unless the user has overridden us in |
| * the environment. |
| */ |
| char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST"); |
| if (target_host) |
| target_host = xstrdup(target_host); |
| else |
| target_host = xstrdup(hostandport); |
| |
| transport_check_allowed("git"); |
| |
| /* |
| * These underlying connection commands die() if they |
| * cannot connect. |
| */ |
| if (git_use_proxy(hostandport)) |
| conn = git_proxy_connect(fd, hostandport); |
| else |
| conn = git_tcp_connect(fd, hostandport, flags); |
| /* |
| * Separate original protocol components prog and path |
| * from extended host header with a NUL byte. |
| * |
| * Note: Do not add any other headers here! Doing so |
| * will cause older git-daemon servers to crash. |
| */ |
| strbuf_addf(&request, |
| "%s %s%chost=%s%c", |
| prog, path, 0, |
| target_host, 0); |
| |
| /* If using a new version put that stuff here after a second null byte */ |
| if (version > 0) { |
| strbuf_addch(&request, '\0'); |
| strbuf_addf(&request, "version=%d%c", |
| version, '\0'); |
| } |
| |
| packet_write(fd[1], request.buf, request.len); |
| |
| free(target_host); |
| strbuf_release(&request); |
| return conn; |
| } |
| |
| /* |
| * Append the appropriate environment variables to `env` and options to |
| * `args` for running ssh in Git's SSH-tunneled transport. |
| */ |
| static void push_ssh_options(struct argv_array *args, struct argv_array *env, |
| enum ssh_variant variant, const char *port, |
| enum protocol_version version, int flags) |
| { |
| if (variant == VARIANT_SSH && |
| version > 0) { |
| argv_array_push(args, "-o"); |
| argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT); |
| argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d", |
| version); |
| } |
| |
| if (flags & CONNECT_IPV4) { |
| switch (variant) { |
| case VARIANT_AUTO: |
| BUG("VARIANT_AUTO passed to push_ssh_options"); |
| case VARIANT_SIMPLE: |
| die(_("ssh variant 'simple' does not support -4")); |
| case VARIANT_SSH: |
| case VARIANT_PLINK: |
| case VARIANT_PUTTY: |
| case VARIANT_TORTOISEPLINK: |
| argv_array_push(args, "-4"); |
| } |
| } else if (flags & CONNECT_IPV6) { |
| switch (variant) { |
| case VARIANT_AUTO: |
| BUG("VARIANT_AUTO passed to push_ssh_options"); |
| case VARIANT_SIMPLE: |
| die(_("ssh variant 'simple' does not support -6")); |
| case VARIANT_SSH: |
| case VARIANT_PLINK: |
| case VARIANT_PUTTY: |
| case VARIANT_TORTOISEPLINK: |
| argv_array_push(args, "-6"); |
| } |
| } |
| |
| if (variant == VARIANT_TORTOISEPLINK) |
| argv_array_push(args, "-batch"); |
| |
| if (port) { |
| switch (variant) { |
| case VARIANT_AUTO: |
| BUG("VARIANT_AUTO passed to push_ssh_options"); |
| case VARIANT_SIMPLE: |
| die(_("ssh variant 'simple' does not support setting port")); |
| case VARIANT_SSH: |
| argv_array_push(args, "-p"); |
| break; |
| case VARIANT_PLINK: |
| case VARIANT_PUTTY: |
| case VARIANT_TORTOISEPLINK: |
| argv_array_push(args, "-P"); |
| } |
| |
| argv_array_push(args, port); |
| } |
| } |
| |
| /* Prepare a child_process for use by Git's SSH-tunneled transport. */ |
| static void fill_ssh_args(struct child_process *conn, const char *ssh_host, |
| const char *port, enum protocol_version version, |
| int flags) |
| { |
| const char *ssh; |
| enum ssh_variant variant; |
| |
| if (looks_like_command_line_option(ssh_host)) |
| die(_("strange hostname '%s' blocked"), ssh_host); |
| |
| ssh = get_ssh_command(); |
| if (ssh) { |
| variant = determine_ssh_variant(ssh, 1); |
| } else { |
| /* |
| * GIT_SSH is the no-shell version of |
| * GIT_SSH_COMMAND (and must remain so for |
| * historical compatibility). |
| */ |
| conn->use_shell = 0; |
| |
| ssh = getenv("GIT_SSH"); |
| if (!ssh) |
| ssh = "ssh"; |
| variant = determine_ssh_variant(ssh, 0); |
| } |
| |
| if (variant == VARIANT_AUTO) { |
| struct child_process detect = CHILD_PROCESS_INIT; |
| |
| detect.use_shell = conn->use_shell; |
| detect.no_stdin = detect.no_stdout = detect.no_stderr = 1; |
| |
| argv_array_push(&detect.args, ssh); |
| argv_array_push(&detect.args, "-G"); |
| push_ssh_options(&detect.args, &detect.env_array, |
| VARIANT_SSH, port, version, flags); |
| argv_array_push(&detect.args, ssh_host); |
| |
| variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH; |
| } |
| |
| argv_array_push(&conn->args, ssh); |
| push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags); |
| argv_array_push(&conn->args, ssh_host); |
| } |
| |
| /* |
| * This returns the dummy child_process `no_fork` if the transport protocol |
| * does not need fork(2), or a struct child_process object if it does. Once |
| * done, finish the connection with finish_connect() with the value returned |
| * from this function (it is safe to call finish_connect() with NULL to |
| * support the former case). |
| * |
| * If it returns, the connect is successful; it just dies on errors (this |
| * will hopefully be changed in a libification effort, to return NULL when |
| * the connection failed). |
| */ |
| struct child_process *git_connect(int fd[2], const char *url, |
| const char *prog, int flags) |
| { |
| char *hostandport, *path; |
| struct child_process *conn; |
| enum protocol protocol; |
| enum protocol_version version = get_protocol_version_config(); |
| |
| /* |
| * NEEDSWORK: If we are trying to use protocol v2 and we are planning |
| * to perform a push, then fallback to v0 since the client doesn't know |
| * how to push yet using v2. |
| */ |
| if (version == protocol_v2 && !strcmp("git-receive-pack", prog)) |
| version = protocol_v0; |
| |
| /* Without this we cannot rely on waitpid() to tell |
| * what happened to our children. |
| */ |
| signal(SIGCHLD, SIG_DFL); |
| |
| protocol = parse_connect_url(url, &hostandport, &path); |
| if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) { |
| printf("Diag: url=%s\n", url ? url : "NULL"); |
| printf("Diag: protocol=%s\n", prot_name(protocol)); |
| printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL"); |
| printf("Diag: path=%s\n", path ? path : "NULL"); |
| conn = NULL; |
| } else if (protocol == PROTO_GIT) { |
| conn = git_connect_git(fd, hostandport, path, prog, version, flags); |
| } else { |
| struct strbuf cmd = STRBUF_INIT; |
| const char *const *var; |
| |
| conn = xmalloc(sizeof(*conn)); |
| child_process_init(conn); |
| |
| if (looks_like_command_line_option(path)) |
| die(_("strange pathname '%s' blocked"), path); |
| |
| strbuf_addstr(&cmd, prog); |
| strbuf_addch(&cmd, ' '); |
| sq_quote_buf(&cmd, path); |
| |
| /* remove repo-local variables from the environment */ |
| for (var = local_repo_env; *var; var++) |
| argv_array_push(&conn->env_array, *var); |
| |
| conn->use_shell = 1; |
| conn->in = conn->out = -1; |
| if (protocol == PROTO_SSH) { |
| char *ssh_host = hostandport; |
| const char *port = NULL; |
| transport_check_allowed("ssh"); |
| get_host_and_port(&ssh_host, &port); |
| |
| if (!port) |
| port = get_port(ssh_host); |
| |
| if (flags & CONNECT_DIAG_URL) { |
| printf("Diag: url=%s\n", url ? url : "NULL"); |
| printf("Diag: protocol=%s\n", prot_name(protocol)); |
| printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL"); |
| printf("Diag: port=%s\n", port ? port : "NONE"); |
| printf("Diag: path=%s\n", path ? path : "NULL"); |
| |
| free(hostandport); |
| free(path); |
| free(conn); |
| strbuf_release(&cmd); |
| return NULL; |
| } |
| fill_ssh_args(conn, ssh_host, port, version, flags); |
| } else { |
| transport_check_allowed("file"); |
| if (version > 0) { |
| argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d", |
| version); |
| } |
| } |
| argv_array_push(&conn->args, cmd.buf); |
| |
| if (start_command(conn)) |
| die(_("unable to fork")); |
| |
| fd[0] = conn->out; /* read from child's stdout */ |
| fd[1] = conn->in; /* write to child's stdin */ |
| strbuf_release(&cmd); |
| } |
| free(hostandport); |
| free(path); |
| return conn; |
| } |
| |
| int finish_connect(struct child_process *conn) |
| { |
| int code; |
| if (!conn || git_connection_is_socket(conn)) |
| return 0; |
| |
| code = finish_command(conn); |
| free(conn); |
| return code; |
| } |